shell

• During the launch phase, it would ride in a protective aluminum shell .
  在发射阶段，它盛在一只保护的铝壳里。
• The secretary had put forth his soft head from the official shell .
  国务秘书从他的官员的硬壳里伸出了柔软的脑袋。
• The dust shell is she condensate of the mass ejected by the central star .
  尘埃壳则是中央星喷射出的物质的冷凝物。
• The little girl threaded the shells together and wore them round her neck .
  这个小姑娘将贝壳穿在一起，戴在脖子上。
• All the alkali metals have a single s-electron outside a closed shell .
  所有的碱金属都在闭合壳层之外有一单个S电子。
• Ostracodes are small animals, most of which have a two valved shell .
  介形虫是小型动物，其中大部份都具有两瓣的外壳。
• He picked up his bag of shells and walked toward the end of the island .
  他提起他那支装有贝壳的袋子，向海岛沿岸走去。
• Ralph grasped the idea and hit the shell with air from his diaphragm .
  拉尔夫抓住了要领，运用横隔膜的气往贝壳里猛送。
• A few mortar shells were landing somewhere with a flat thudding sound .
  不知哪里落了几颗迫击炮弹，闷声闷气地轰轰几响。